Current File : //home2/vacivi36/ava/mod/assign/classes/cache/overrides.php
<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* Cache data source for the assign overrides.
*
* @package mod_assign
* @copyright 2021 Shamim Rezaie <shamim@moodle.com>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
declare(strict_types=1);
namespace mod_assign\cache;
use cache_definition;
/**
* Class assign_overrides
*
* @package mod_assign
* @copyright 2021 Shamim Rezaie <shamim@moodle.com>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class overrides implements \cache_data_source {
/** @var overrides the singleton instance of this class. */
protected static $instance = null;
/**
* Returns an instance of the data source class that the cache can use for loading data using the other methods
* specified by this interface.
*
* @param cache_definition $definition
* @return object
*/
public static function get_instance_for_cache(cache_definition $definition): overrides {
if (is_null(self::$instance)) {
self::$instance = new overrides();
}
return self::$instance;
}
/**
* Loads the data for the key provided ready formatted for caching.
*
* @param string|int $key The key to load.
* @return mixed What ever data should be returned, or false if it can't be loaded.
* @throws \coding_exception
*/
public function load_for_cache($key) {
global $DB;
[$assignid, $ug, $ugid] = explode('_', $key);
$assignid = (int) $assignid;
switch ($ug) {
case 'u':
$userid = (int) $ugid;
$override = $DB->get_record(
'assign_overrides',
['assignid' => $assignid, 'userid' => $userid],
'duedate, cutoffdate, allowsubmissionsfromdate'
);
break;
case 'g':
$groupid = (int) $ugid;
$override = $DB->get_record(
'assign_overrides',
['assignid' => $assignid, 'groupid' => $groupid],
'sortorder, duedate, cutoffdate, allowsubmissionsfromdate'
);
break;
default:
throw new \coding_exception('Invalid cache key');
}
// Return null instead of false, because false will not be cached.
return $override ?: null;
}
/**
* Loads several keys for the cache.
*
* @param array $keys An array of keys each of which will be string|int.
* @return array An array of matching data items.
*/
public function load_many_for_cache(array $keys) {
$results = [];
foreach ($keys as $key) {
$results[] = $this->load_for_cache($key);
}
return $results;
}
}
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